diff --git a/Dice/Dice.go b/Dice/Dice.go
index d9ea822..70e7f52 100644
--- a/Dice/Dice.go
+++ b/Dice/Dice.go
@@ -4,15 +4,26 @@ import (
 	"fmt"
 	"math/rand"
 	"strings"
+	"time"
 
 	"gitlab.com/EternalWanderer/dice-roller/Colors"
 )
 
 var (
 	surfaces, diceThrows, modidier int
+	initRandom                     bool
 )
 
+func InitRandom(initialised bool) {
+	if initialised {
+		return
+	}
+	rand.Seed(time.Now().Unix())
+	initRandom = true
+}
+
 func Cast(surfaces, diceThrows, modifier int) {
+	InitRandom(initRandom)
 	var (
 		casts       []int
 		cast, total int
@@ -46,13 +57,16 @@ func Cast(surfaces, diceThrows, modifier int) {
 }
 
 func SimpleCast() int {
+	InitRandom(initRandom)
 
 	var cast = rand.Intn(20) + 1
 
 	return cast
 }
 
-func Advantage(x, y int) (int, int, int) {
+func Advantage() (int, int, int) {
+	x := SimpleCast()
+	y := SimpleCast()
 	if x > y {
 		return x, x, y
 	} else {
@@ -60,7 +74,9 @@ func Advantage(x, y int) (int, int, int) {
 	}
 }
 
-func Disadvantage(x, y int) (int, int, int) {
+func Disadvantage() (int, int, int) {
+	x := SimpleCast()
+	y := SimpleCast()
 	if x < y {
 		return x, x, y
 	} else {
diff --git a/main.go b/main.go
index 34afab7..56baa1a 100644
--- a/main.go
+++ b/main.go
@@ -3,9 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
-	"math/rand"
 	"os"
-	"time"
 
 	"gitlab.com/EternalWanderer/dice-roller/Coin"
 	"gitlab.com/EternalWanderer/dice-roller/Colors"
@@ -19,7 +17,6 @@ var (
 
 func main() {
 	ParseFlags()
-	rand.Seed(time.Now().Unix())
 
 	switch {
 
@@ -41,9 +38,7 @@ func main() {
 		Coin.Toss(diceThrows)
 
 	case advantage:
-		x := Dice.SimpleCast()
-		y := Dice.SimpleCast()
-		result, x_block, y_block := Dice.Advantage(x, y)
+		result, x_block, y_block := Dice.Advantage()
 		if modifier != 0 {
 			fmt.Printf("%sRolling 1d20 + %d with advantage...%s\n", Colors.ColorGreen, modifier, Colors.ColorReset)
 			fmt.Printf("\t%s%s%s\n", Colors.ColorYellow, "Without modifier...", Colors.ColorReset)
@@ -54,11 +49,16 @@ func main() {
 			fmt.Printf("%sRolling 1d20 with advantage...%s\n", Colors.ColorGreen, Colors.ColorReset)
 			fmt.Printf("\t%s%d%s\t%s %d\t%s %d\n", Colors.ColorGreen, result, Colors.ColorReset, "x:", x_block, "y:", y_block)
 		}
+		switch result {
+		case 20:
+			fmt.Printf("\t%sNatural%s 20!%s\n", Colors.ColorMagenta, Colors.ColorGreen, Colors.ColorReset)
+		case 1:
+			fmt.Printf("\t%sNatural%s 1!%s\n", Colors.ColorMagenta, Colors.ColorRed, Colors.ColorReset)
+		default:
+		}
 
 	case disadvantage:
-		x := Dice.SimpleCast()
-		y := Dice.SimpleCast()
-		result, x_block, y_block := Dice.Disadvantage(x, y)
+		result, x_block, y_block := Dice.Disadvantage()
 		if modifier != 0 {
 			fmt.Printf("%sRolling 1d20 + %d with disadvantage...%s\n", Colors.ColorRed, modifier, Colors.ColorReset)
 			fmt.Printf("\t%s%s%s\n", Colors.ColorYellow, "Without modifier...", Colors.ColorReset)
@@ -69,6 +69,13 @@ func main() {
 			fmt.Printf("%sRolling 1d20 with disadvantage...%s\n", Colors.ColorRed, Colors.ColorReset)
 			fmt.Printf("\t%s%d%s\t%s %d\t%s %d\n", Colors.ColorRed, result, Colors.ColorReset, "x:", x_block, "y:", y_block)
 		}
+		switch result {
+		case 20:
+			fmt.Printf("\t%sNatural%s 20!%s\n", Colors.ColorMagenta, Colors.ColorGreen, Colors.ColorReset)
+		case 1:
+			fmt.Printf("\t%sNatural%s 1!%s\n", Colors.ColorMagenta, Colors.ColorRed, Colors.ColorReset)
+		default:
+		}
 
 	case attacks > 1:
 		for i := 0; i < attacks; i++ {